Compound Anti-interference Quantitative Control Of Multi-source Interference Nonlinear System

Many kinds of disturbances widely exist in practical systems,such as external disturbance,measurement error,internal disturbance,etc..These disturbances seriously affect the closed-loop system performance.Hence the anti-disturbance control has become a hot issue in the control theory field.In order to save the system resources and reduce the amount of information in the transmission channel,the problem of signal quantization has been received more and more atten-tion.Quantized control also brings great challenge to the system design,that is,how to eliminate the influence of quantization error on the system.Especially for nonlinear systems with multi-source disturbances,few research results have been obtained.In this paper,the problem of com-posite hierarchical anti-disturbance control for nonlinear systems with mult-source disturbances and quantized inputs is studied.The main results are listed as follows:·For a class of nonlinear systems with multi-source disturbances and quantized inputs,acomposite anti-disturbance controller based on extended state observer is proposed.Theinput quantization and output quantization are simultaneously considered in the controllerdesign.Firstly,an extended state observer is designed to estimate the unknown state andexternal disturbance based on the output quantization information.Secondly,an observer-based L₂-L_?output feedback quantized controller is designed.In order to eliminate theinfluence of quantization error,a compensation term is introduced in the controller.Thirdly,the stability of the closed-loop system and the L₂-L_?performance are analyzed by usingLyapunov function theory.Finally,the effectiveness of the proposed method is verified by anumerical example and an aircraft system.·An adaptive static output feedback anti-disturbance quantized controller is proposed for non-linear systems with multi-source disturbances,input quantization and unknown parameters.Using the output information,the disturbance observer and the adaptive law are construct-ed.An adaptive static output feedback anti-disturbance quantized controller is designed bycombining the estimated values of the disturbance and unknown parameters,and a compen-sation term is introduced to eliminate the influence of quantization error.The stability andH_?performance are analyzed by using Lyapunov function method.Finally,a simulationexample is given to verify the validity of the results.